function getQueryStringArgs() {
    //取得查询字符串并去掉开头的问号
    var qs = (location.search.length > 0 ? location.search.substring(1) : ""),
        //保存数据的对象
        args = {},
        //取得每一项
        items = qs.length ? qs.split("&") : [],
        item = null,
        name = null,
        value = null,
        //在for循环中使用
        i = 0,
        len = items.length;
    //逐个将每一项添加到args对象中
    for (i = 0; i < len; i++) {
        item = items[i].split("=");
        name = decodeURIComponent(item[0]);
        value = decodeURIComponent(item[1]);

        if (name.length) {
            args[name] = value;
        }
    }
    return args;
}
var args = getQueryStringArgs();
console.log(args['q']);
console.log(args['num']);
